If flash was on a SUPER low cooldown, it would give immobile champs more room to breath. The movement gap between slow adcs and speedy assassins would close greatly. I mean in dota 2, if puck (Leblanc) were to get a blink, a rubick (Sylas but slow) with a blink can still as easily catch up to him because the movement deficit is minimized.
I think other summs would becomw more significant
Imagkne a big heal on a 24 second cd Or cleansing on about 30 sex (dont know cleanse cd)
Shen could tp everywhere
Ghost would probably be able to stack
Smite... gain a stack every 10 seconds with a 1 .5sec cd...
it will be blink dagger of dota, and you know how blink dagger in dota get used.
will abuse it to no end in lower and mid elos because of how powerful their flash engage is (theres some other champions who also will abuse such a thing, including a mobile champion like 
)
it doesn't change anything All summoner spells are balanced based on other summoner spells not around champions also some champions function really well with flash imagine if annie can flash tibbers you on a lower cd youd hate your life
Dota 2 is a different beast and I don't think having flash up like a blink dagger would be healthy for League. Its giving a great gap close to engage for free no draw back like today if you miss a flash engage. It's too OP for league. I do wish we had Wukong like Monkey King from dota tho.
